CVE-2021-34574Network attack vector

Account password weakening via client-side-only validation

Published Aug 2, 2021 · Updated Sep 16, 2024

Password-policy bypass in mbCONNECT24 and myREX24 portals through 2.11.2 allows remote authenticated users to set weak account passwords. The account-password change workflow validates policy requirements only in client-side logic, so a modified request reaches the server without equivalent enforcement. An existing portal account and modification of its own password-change request are required; the bounded result is a policy-violating password for that account.

CVSS severity4.3
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Password-policy bypass in mbCONNECT24 and myREX24 portals through 2.11.2 allows remote authenticated users to set weak account passwords. The account-password change workflow validates policy requirements only in client-side logic, so a modified request reaches the server without equivalent enforcement. An existing portal account and modification of its own password-change request are required; the bounded result is a policy-violating password for that account.

The record

CVE
CVE-2021-34574
Published
Aug 2, 2021
Updated
Sep 16, 2024
Vendor
Helmholz GmbH & Co. KG
Product
myREX24.virtual
Classifications
CWE-669
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2 <=2.11.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Helmholz GmbH & Co. KG · myREX24.virtualversion=2 <=2.11.2
Helmholz GmbH & Co. KG · myREX24version=2 <=2.11.2
MB connect line · mbCONNECT24version=2 <=2.11.2
MB connect line · mymbCONNECT24version=2 <=2.11.2

Published CVSS scores

4.3CERT@VDECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-669Incorrect Resource Transfer Between Spheres

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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